cleanup-nodes.js

function cleanup(node) {
	const removeMe = 
		node instanceof Image
		|| node instanceof Text
		|| node instanceof Comment
		|| node.tagName === 'svg'
		|| node.tagName === 'iframe';

	const ignoreChilds =
		node.tagName === 'svg'
		|| node.tagName === 'iframe';

	if (node.textContent && !node.childNodes?.length) {
		node.textContent = '';
	}
	else if (node.childNodes?.length && !ignoreChilds) {
		for (const child of node.childNodes) {
			cleanup(child);
		}
	}
	else if (removeMe) {
		action = 'remove';
		node.remove();
	}
}

cleanup(document.body);
console.log('done');